EXHIBIT 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the incorporation by reference in this Registration Statement on Form S-3 of Aptevo Therapeutics Inc. (the “Company”) of our report dated March 30, 2023, relating to the Company’s consolidated financial statements appearing in the Annual Report on Form 10-K of the Company for the year ended December 31, 2022, filed with the Securities and Exchange Commission. We also consent to the reference to us under the heading “Experts” in the prospectus, which is part of this Registration Statement.
/s/ Moss Adams LLP
Seattle, Washington
November 22, 2023